Dry cereal straw in small or big bales, round or rectangular. Burn grey straw not yellow straw. Cereal straw should be weathered for at least a week before baling, and not baled at high density. It burns best if first rained on, then turned and left to dry to max 16%, and stored under cover. Rain washing puts the potash back into the soil. Cereal straw from sandy soil burns better and with less ash than straw from clay soils.